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Warmup In-Slab Heating Cable
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At a Glance
Quick Decision Guide
Cable Length
93 ft.
Wattage
500 W
Amperage at 240 V
2.1 A
Amperage at 208 V
1.8 A
Coverage at 3" Spacing
24 Sq. Ft.
Coverage at 4" Spacing
30 Sq. Ft.
Coverage at 5" Spacing
39 Sq. Ft.
Cold Lead
16 ft.
Why Choose This Product
Key Benefits
Thermal Storage
Heats the concrete mass for extended heat release
Multiple Applications
Suitable for primary heating, thermal storage and frost heave protection
Adjustable Output
Cable spacing can be changed to meet project heating requirements
Twin-Conductor Design
Provides a one-point electrical connection without a return cable
Concrete Installation
Designed for installation within building foundations and slabs
Multiple Cable Sizes
Available in lengths and outputs for different project requirements
Product Information
Product Details
Specifications
Brand
Warmup®
Part Number
WODH-240/500
Product Type
In-Slab Electric Heating Cable
Cable Length
93 ft.
Wattage
500 W
Operating Voltage
208-277 V
Amperage at 208 V
1.8 A
Amperage at 240 V
2.1 A
Resistance
114.30 Ω
Coverage at 3" Spacing
24 Sq. Ft.
Coverage at 4" Spacing
30 Sq. Ft.
Coverage at 5" Spacing
39 Sq. Ft.
Minimum Cable Spacing
3"
Construction
Copper Resistance Cable with FPE Insulation & Metal Sheathing
Cable Thickness
3/8"
Cold Lead Length
16 ft.
Applications
In-Slab Heating, Thermal Storage & Frost Heave Protection
About This Product
In-Slab Heating and Thermal Storage
Warmup® In-Slab Cable is an electric heating cable designed for embedding in concrete foundations to provide primary heating and thermal storage. The system heats the concrete mass so stored heat can be released over an extended period, making it particularly useful for buildings using solar power or time-of-use electricity rates.
Residential and Commercial Applications
The WODH cable can be installed in dirt or sand beds or secured to lightweight mesh before the concrete foundation is poured. Applications include residential basement heating, commercial slab heating, and frost heave protection for slabs exposed to cold temperatures.
Twin-Conductor Cable with One-Point Connection
The twin-conductor design eliminates the need to return the cable to the connection point and is constructed to cancel electromagnetic field interference. Each cable includes a factory-attached 16 ft. cold lead for connection outside the heated area.
Adjustable Heat Output Through Cable Spacing
Heating output can be adjusted by changing the spacing between cable runs to meet project requirements. Closer spacing provides greater heat output for primary in-slab heating, while wider spacing can be used for lower-output applications such as frost heave protection. Cable runs must be spaced at least 3" apart.
System Sizing Based on Building Heat Loss
In-slab heating systems should be sized according to the building's calculated heat loss and intended charging period. Installed cable capacity must exceed the building heat loss when the system operates for only part of the day, making proper system design important for thermal storage applications.
Common Questions
Frequently Asked Questions
What is Warmup In-Slab Cable used for?
The cable is designed for primary in-slab heating, thermal storage, and frost heave protection in residential and commercial applications.
Where is the heating cable installed?
The cable can be installed in dirt or sand beds or secured to lightweight mesh and embedded within a concrete foundation pour.
How far apart should Warmup In-Slab Cable be spaced?
Spacing depends on the required heating output. The minimum spacing between cable runs is 3". System spacing and capacity should be determined according to the heating requirements of the project.
Can the cable be used for thermal storage heating?
Yes. Thermal storage is one of its primary applications. The cable heats the concrete mass so stored heat can be released over an extended period.
Can Warmup In-Slab Cable be used for frost heave protection?
Yes. The cable can provide lower-output slab heating for frost heave protection in commercial and other cold-temperature applications.
Does an in-slab heating system need a heat-loss calculation?
Yes. Warmup recommends determining the building heat loss when planning cable quantity and heating output. Thermal storage systems may require installed capacity above the calculated heat loss depending on the daily charging period.
Can the heating cable contact combustible materials?
No. The WODH cable should not contact combustible material. Where installed above wood underlayment or insulation panels, it can be raised using metal lath or fiberglass mesh.